#!/bin/sh
# This is a script to initialize udev, which populates the /dev
# directory with device nodes, scans for devices, loads the
# appropriate kernel modules, and configures the devices.

#
# Taken from slackware 12.2, with some mods :)
#

PATH="/sbin:/bin:/usr/sbin:/usr/bin:"
OPT=""

. /etc/udev/udev.conf

# remove trailing slash from udev_root
UDEV_ROOT=$(echo "${udev_root}" |sed 's/\/*$//')

case "$1" in
    start)
	# Sanity check #1, udev requires that the kernel support tmpfs:
        if ! grep -wq tmpfs /proc/filesystems ; then
          echo "Sorry, but you need tmpfs support in the kernel to use udev."
          echo
          echo "FATAL:  Refusing to run /etc/rc.d/rc.udev."
          exit 1
        fi

        # Sanity check #2, make sure that a 2.6.x kernel is new enough:
        if [ "$(uname -r | cut -f 1,2 -d .)" = "2.6" ]; then
          if [ "$(uname -r | cut -f 3 -d . | sed 's/[^[:digit:]].*//')" -lt "15" ]; then
            echo "Sorry, but you need a 2.6.15+ kernel to use udev."
            echo "Your kernel version is only $(uname -r)."
            echo
            echo "FATAL:  Refusing to run /etc/rc.d/rc.udev."
            exit 1
          fi
        fi

        # Sanity check #3, make sure the udev package was not removed.  If udevd
        # is not there, this will also shut off this script to prevent further
        # problems:
        if [ ! -x /sbin/udevd ]; then
          chmod 644 /etc/rc.d/rc.udev
          echo "No udevd daemon found."
          echo "Turning off udev:  chmod 644 /etc/rc.d/rc.udev"
          echo "FATAL:  Refusing to run /etc/rc.d/rc.udev."
          exit 1
        fi

        # Disable hotplug helper since udevd listens to netlink:
        if [ -e /proc/sys/kernel/hotplug ]; then
          echo "" > /proc/sys/kernel/hotplug
        fi

	# if udevd is already running, rc.udev start will try to re-run
	# failed events. Else, it will start udevd.
	if ps axc | grep -q udevd ; then
	  OPT="--type=failed $OPT"
	  ( cd ${UDEV_ROOT}/.udev
	    for TMPFILE in tmp-rules-*.rules ; do
		mv $TMPFILE /etc/udev/rules.d/${TMPFILE/tmp-rules--/} 2>/dev/null
	    done
	  ) 
	else
	  # Mount tmpfs on $UDEV_ROOT:
	  if ! grep -E -q "^[^[:space:]]+ $UDEV_ROOT tmpfs" /proc/mounts; then
		# umount shm if needed
		if grep -E -q "^[^[:space:]]+ $UDEV_ROOT/shm tmpfs" /proc/mounts; then
			umount -l $UDEV_ROOT/shm
		fi

		# Umount pts if needed, we will remount it later:
		if grep -E -q "^[^[:space:]]+ $UDEV_ROOT/pts devpts" /proc/mounts; then
			umount -l $UDEV_ROOT/pts
		fi

		# Mount tmpfs on $UDEV_ROOT:
		# the -n is because we don't want $UDEV_ROOT umounted when
		# someone (rc.[06]) calls umount -a
		mount -n -o mode=0755 -t tmpfs tmpfs $UDEV_ROOT 

		# Remount pts:
		mkdir $UDEV_ROOT/pts 2> /dev/null
		mount -n -o mode=0620,gid=5 -t devpts devpts $UDEV_ROOT/pts
	  fi

	  # Add the static nodes to $UDEV_ROOT:
	  cp --preserve=all --recursive --remove-destination /lib/udev/devices/* $UDEV_ROOT 

	  # Start udevd:
	  echo "Starting udevd:  /sbin/udevd --daemon"
	  /sbin/udevd --daemon

	  # Create rootdev rules
	  DEVICENUMBER=$( /bin/stat -c %d / )
	  MAJORNUMBER=$(($DEVICENUMBER / 256))
	  MINORNUMBER=$(($DEVICENUMBER % 256))

	  echo 'ACTION=="add", SUBSYSTEM=="block", ENV{MAJOR}=="'$MAJORNUMBER'", ENV{MINOR}=="'$MINORNUMBER'", SYMLINK+="root"' > /dev/.udev/rules.d/61-dev-root-link.rules

	fi

	echo "Triggering udev events:  /sbin/udevadm trigger $OPT"	
	# Call udevtrigger and udevsettle to do the device configuration:
	/sbin/udevadm trigger $OPT && /sbin/udevadm settle --timeout=120

	;;
    stop)
	echo "Stopping udevd"
        if [ -e /proc/sys/kernel/hotplug ]; then
          echo /sbin/hotplug > /proc/sys/kernel/hotplug
        fi
	killall udevd 
	;;
    restart)
	echo "Restarting udevd"
	killall udevd
	sleep 5
	udevd --daemon
	;;
    reload)
	echo "Reloading udev rules"
	udevadm control reload_rules
	cp --preserve=all --recursive --update /lib/udev/devices/* $UDEV_ROOT
	;;
    force-reload)
	echo "Updating all available device nodes in $UDEV_ROOT"
	udevadm control reload_rules
	rm -rf $UDEV_ROOT/.udev $UDEV_ROOT/disk
	cp --preserve=all --recursive --update /lib/udev/devices/* $UDEV_ROOT
	;;
	
    *)
	echo "Usage: $0 {start|stop|restart|reload|force-reload}"
	exit 1
	;;
esac
